Drop-hammer board



Patented dan.. 2, i923.

lhlfdillqll Sri CHARLES J. KLEST AND HARRY E. KLEIST, 0F JAMESTOWN, 'NE'W'YYOR/K.

DROP-'HAMMER BOARD.

Application filed November 4, 1,9211.' Serial No. 512,958. l

To all whom at may concern:

Be it known that we, CHARLES J. Knnis'r and HARRY E. KLErs'r, citizens of the United States, residinor at the city of Jamestown, in the county of hautauqua and State of New York, have invented certain new and useful. improvements in Drop-Hammer Boards,of which the following, taken in connection with the accompanying drawings, is a specification.

The invention relates to lifting boards for drop hammers or rams; and the improvement consists in providing a strongl and durable board so constructed that it willnot lose its resilience, or be easily checked, split, sprung or warped, thereby `providing a strong element of safety for the operator, since the board cannot split, thatis, have portions thereof split ofi' and fly, thereby endangering the lives and persons of the operators of the drop hammer, and at the same time greatly prolonging the life of the hammer board. l

These objects are attained by providing selected strips of quarter sawn hard wood, preferably hard maple, which are attached to one another by glued joints, the ends being also covered with an adhesive which prevents checking, said strips being held firmly together by means of spaced headed bolts or rivets, as further shown and described in this specification and drawings and pointed out in claim.

ln the drawings, Figure 1 is an end and plan view of the hammer board showing the preferred construction of the same, said board being broken away at one of the crosswise holding bolts or rivets to show the preferred construction and arrangement ofthe same. Fig. 2 is an edgewise elevation'of the hammer board attached to the hammer at its lower end and extending up through the frictionalllifting rolls; and Fig. 3 is a side elevation of the attachment to the hammer. Fig. a is an elevation of a portion of one edge, and Fig. 5 of a portion of the other edge of the hammer board, showing the spaced screw bolts with the riveted nuts thereon preferably of the vround construction so as not to weaken the wood of the hammer board more than is necessary, the head of th`e nut being countersunk suficiently to permit the smooth runningbf the board. Fig. 6 is a sectional view at line 6-6 in 1, showing an elevation of the crosswise bolt in position with countersunk end portions; and Fig. 7 is a sectional view of the preferred form 0f bolt. Fig. 8 is a side elevation of a form of boltwhich may lpe used without departing from our inven- 'ion.

rLike characters of reference refer to corresponding parts in the several views.

The numerallO designates vthe hammer board which is made from strips 11 of quarter sawn stock, a sufli'cient number of strips being used to providethe required width and length from as straight grained -stoclr as possible.

. The width and length of drop hammer boards vary according to the weight of the hammer or ram. They are usually proportioned about one and one-fourth to two inches in thickness by three to nine inches in width and from siX to ten feet in length. Y

The strips must be made from air seasoned or dried stock since the heating of thestock in dry kilns seems to kill the resilience of the wood. The best wood is hard maple, and

the boards preferably have from three to eight strips according to the grade of the stock.

The lengthwise joints 12 are preferably true and'straight, and the strips so selected as to keep the board straight and true under the blows of the drops. the hammer boards being placed in the gluing clamps for that purpose.k The ends 13 are also coveredwith glue or other tough and strong adhesive which prevents checking and,y splintering of said ends under the heavy shock strain of the blows of vthe hammer.

The board l0, after gluing the strips, has

the crosswise holes '1f/lbored theretl'lroughl at spaced distances, the holes 1.1i near the ends l13 being a suliicient distance therefrom to prevent the blows of the hammer breaking into said end holes. Each ofthe ends of the holes 1li is countersunk as shown at 15 to receive therein the head 17 and washer 27 on one side and nut 18 on the other end of the screw bolt 16, which bolts fit closely in the holes 1li. rl`he series of bolts clamp and hold the strips against splitting or separating. This form of screw bolt is preferred since it holds of the hammer board with a minimum weakening of said board. The beveled ceuntersunk head 19 and hexagonal 'nut 2O in the modification 2l of the bolt 16 may heavy hammer 25 as it4 The lengthwise joints 12 are glued,`

strongly upon the wood possible into the nuts l18 to clamp f the Wooden strips, the ends of the bolts 16 vare headed or riveted as shown at 22.0nt0 lthe' nuts 187 thereby ensuring that the blows of the hammer 25 will not-fshi-Veror'splitthe hammer board Orstart the nuts 18. A rivet might be -used in Vplace voiithe :bolt-16. The bolt is preferred, however. The `glueor adhesive covering` `for the ends of; the' board Vassists in preyenting-'th-is non-splitting of the end of the board. Both ends arey so covered so that lthe board is reversible. Thiswill be appreciated- When` it is understood-'that the board 10 is held inthe mortise '23 bythe Wedges 24 in the han'nner l25 so that Whenthegrip of the hitting` rollersV 26 is released/and AtheKl-hua'mmer 25 'dreps,- *the impact of the hammer bloW-bringsa strong crushing strain upon theventire boardand particularly f upon l its:I lower end.

hlhe commenlsingle-piece boardv as heretofore made, usually lasts from five to Anine `days underl 'this #shivering strain, l Whereas the boards made: accordin'gto our improved construction, last ffromi four to six Weeks,

thereby not only providing a strongfactor of safety for the operator ofthe drop hammer, but also proving far more. economical,

Vthough the cost of manufacture is increased vsomewhat over the boa-rd asi'ormerly made. rllhe ,longer life of the improved boards is alsoY a great economy, since it takes about two hoursto change boards when one gives Duty-'causing` the loss-.of two high-priced operatives and the use of the costly machine for that length 'of time.

Vhat isclaimed; as new-is: A' drop hammerboardcomprising a plu- 1'al1ty-oii---Wooden strips-attached to one anotherbyglued joints; the ends of said hammer' board covered vby adstrong` adhesive to; prevent checking, I spaced lbolts placed crosswi'se through said `strips f to hold the same 'against Vsplitting,:saidbolts having eountersunlr heads and nut-s and riveted` bolt ends yon=said Ynuts `to rigidly hold said Woedenfstrips.

` y In testimony Awhereof We -havewaiixed our signatures in the presence'. of tWo Witnesses.

" .a y@Harnais J. minier;

nanars. .nnnrsr `lVitnesses s i Coni'NNn V. Snvfmson, JTHEO. fTHoMAs HAAG. y 

